<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style type="text/css">
        .container {}
        
        .container .cart {
            width: 300px;
            margin: auto;
        }
        
        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }
        
        .container .total {
            background-color: #ffce46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }
        
        .container .total button {
            margin: 0 10px;
            background-color: #dc4c40;
            height: 35px;
            width: 80px;
            border: 0;
        }
        
        .container .total span {
            color: red;
            font-weight: bold;
        }
        
        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #add8e6;
        }
        
        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }
        
        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;
            left: 55px;
            font-size: 16px;
        }
        
        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }
        
        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration: none;
            background-color: lightgray;
            vertical-align: middle;
        }
        
        .container .item .change .num {
            width: 40px;
            height: 25px;
        }
        
        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }
        
        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="container">
            <my-cart></my-cart>
        </div>
    </div>
    <script type="text/javascript" src="js/vue.js"></script>
    <script type="text/javascript">
        var CartTitle = {
            props: ['uname'],
            template: `
        <div class="title">{{uname}}的商品</div>
        `,
        };
        var CartList = {
            props: ['list'],
            template: `
          <div>
            <div :key='item.id' v-for='item in list' class="item">
              <img :src="item.img"/>
              <div class="name">{{item.name}}</div>
              <div class="change">
                <a href="" @click.prevent='sub(item.id)'>－</a>
                <input type="text" class="num" :value='item.num' @blur='changeNum(item.id, $event)'/>
                <a href="" @click.prevent='add(item.id)'>＋</a>
              </div>
              <div class="del" @click='del(item.id)'>×</div>
            </div>
          </div>
          `,
            methods: {
                changeNum: function(id, event) {
                    this.$emit('change-num', {
                        id: id,
                        type: 'change',
                        num: event.target.value
                    })
                },
                sub: function(id) {
                    this.$emit('change-num', {
                        id: id,
                        type: 'sub'
                    })
                },
                add: function(id) {
                    this.$emit('change-num', {
                        id: id,
                        type: 'add'
                    })
                },
                del: function(id) {
                    this.$emit('cart-del', id);
                }
            }
        };

        var CartTotal = {
            props: ['list'],
            template: `
            <div class="total">
            <span>总价：{{total}}</span>
            <button>结算</button>
          </div>
            `,
            computed: {
                total: function() {
                    var t = 0;
                    this.list.forEach(item => {
                        t += item.price * item.num;
                    });
                    return t;
                }
            }
        };

        Vue.component("my-cart", {
            data: function() {
                return {
                    uname: '张三',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]
                }
            },
            template: `
            <div class='cart'>
              <cart-title :uname='uname'></cart-title>
              <cart-list :list='list' @change-num='changeNum($event)' @cart-del='delCart($event)'></cart-list>
              <cart-total :list='list'></cart-total>
            </div>
            `,
            components: {
                "cart-title": CartTitle,
                "cart-list": CartList,
                "cart-total": CartTotal,
            },
            methods: {
                changeNum: function(val) {
                    if (val.type == 'change') {
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num = val.num;
                                return true;
                            }
                        });
                    } else if (val.type == 'sub') {
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num -= 1;
                                return true;
                            }
                        })
                    } else if (val.type == 'add') {
                        this.list.some(item => {
                            if (item.id == val.id) {
                                item.num += 1;
                                return true;
                            }
                        })
                    }

                },
                delCart: function(id) {
                    // 根据id删除list中对应的数据
                    // 1、找到id所对应数据的索引
                    var index = this.list.findIndex(item => {
                        return item.id = id;
                    });
                    this.list.splice(index, 1);

                }
            }
        });

        var vm = new Vue({
            el: "#app",
            data: {},
        });
    </script>
</body>

</html>